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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 50.5 $ 43.7 $ 47.2
Additions for tax positions of prior years 2.9 8.4 3.1
Additions for tax positions of current year 0.0 1.5 1.5
Reductions for tax positions of prior years (1.1) (2.5) (8.2)
Acquisitions 1.4 0.0 5.3
Decrease resulting from foreign currency translation (8.6) (0.6) (5.2)
Balance at end of year $ 45.1 $ 50.5 $ 43.7